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Income Taxes - Additional Information (Detail) (USD $) | 12 Months Ended
--- | ---
Sep. 30, 2014 | Sep. 30, 2013
Income Taxes [Line Items] |  |
Net change in total valuation allowance | $ 1,677,309 | $ 1,968,988
Operating loss carryforwards, expiration start year | 2018 |
Net operating loss carryforwards will begin to expire | 2014 |
Research and development credits expiry period beginning year | 2023 |
Net operating loss carryforwards for state purposes | 37,399,784 |
Accrued interest | 0 |
Domestic [Member] |  |
Income Taxes [Line Items] |  |
Net operating loss carryforwards for state purposes | 66,320 |
Research and development credit carryforwards | 21,963 |
Stock Option [Member] |  |
Income Taxes [Line Items] |  |
Federal and state net operating losses | 47,885,589 |
Research and development credit [Member] |  |
Income Taxes [Line Items] |  |
Investment credit carryforwards | 17,654,877 |
Manufacturers' investment credit [Member] |  |
Income Taxes [Line Items] |  |
Investment credit carryforwards | $ 29,306 |

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible state and local operating loss carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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